Ski boot attachment



FIG. 1 is a top plan view of a ski boot attachment showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof, the right side being a mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof. 

The ornamental design for a ski boot attachment, as shown and described. 